Over the past few months I have been struck by the number of times Pope Francis has reminded us of the indivisible relationship and union between Christ and his Church. On several of these instances he has quoted a passage that I have become familiar with over the years. It is taken from Pope Paul VI’s Apostolic Exhortation, On Evangelization in the Modern World:

There is thus a profound link between Christ, the Church and evangelization. During the period of the...